|Pictures by Linda Langelo, CSU Extension Horticulture Program Associate|
Populus tremuloides, Aspen have their own beauty. The only tree close to this striking white bark is Paper Birch, Betula papyrifera. Paper birch does not tolerate drought. Aspen trees live in altitudes well above the normal range on the plains which is 3,500 to 4,500 feet. But once Aspens are well established on the plains of eastern Colorado as those in the above pictures, they tend to do well. The trees pictured above were placed by a swimming pool for many years. The pool is now gone and they are still doing well. They survived the last three years of extreme drought. These are not trees recommended for eastern Colorado, but people fall in love with their beauty. The danger is planting trees outside their normal range whereby they succumb to diseases and insects and keeping them in good health is challenging because the environment they need is not available to them.